S2Kart it sounds like a different issue, nice job on fixing it.

The heat bog is not unusual and after getting to know the car you will feel it coming. You give a little gas and the car does not respond, more throttle just means it will lurch once it gets it's breath and the pogo begins. If you feel the throttle go numb, just hold position and it will catch up, don't add more or it just gets worse. Once I feel that dead spot on the throttle I go to neutral and run it up to 3k or so, pulling fresh air into the box for a couple seconds. It is usually fine when I go back to first. I use the same technique for autocross starts in Georgia and Florida after it bit me a couple times waiting at the timing lights. You will start to anticipate this in certain situations, hot weather, stop and go, then you can address it before the embarrassment begins.

 

Sounds like the MAP may need to be cleaned, replugged in.

 

Interesting. I will have to try carts check myself. The last tow days I seem to be having the same problem.

 

exactly the same problem here...
I bought the car a month ago and I tought I was the problem

But now i'm not so sure...

At first I was sure it was my fault.. bad shifting or something like that.

but I realized that this problem is not happening when shifting gears..

When you start (ok)
shift in 2nd (ok)
accelerate (ok)
remove you foot on the gas pedal (ok)
then reaccelerate (There is the bucking action!!)

 

From my experience, heat bog usually only happens in first gear at relativelly low speeds when you let off the accelerator, then reaccelerate. If you're getting this in second gear, you might have another problem.

So you have tried wedging your foot against the carpet next to the gas pedal as I suggested above and this still happens?

 

I'll try that today

If its not my fault (I hope it is)

Its probably a heat bog...and it happens on the first and 2nd gear
when lifting up the accelerator and then reaccelerate.. like you said

Yesterday it happened in first gear...at the start..

Maybe I engaged the clutch too slow like Ludeboye1 said

 

did 100 kilometers today

on speedway ,trafic jam, high speed low speed ect

the problem never happened.

But there was no humidity in the air today.

I've noticed that everytimes the problem happened the humidity in the air was at a high level.

maybe my S2000 is fragile to the cold and humidity h